tumor biomarker

A tumor biomarker is a substance produced by cancer cells or normal cells in response to cancer, found in blood, urine, or tissue. It helps doctors identify the presence of cancer, monitor its progression, or see how well treatment is working. Examples include specific proteins or genetic changes associated with certain cancers. Biomarkers assist in early detection, diagnosis, and personalized treatment planning, making care more targeted and effective. However, they are just one tool among many used to understand and manage cancer.